GROUNDWATER SOURCES IN WISCONSIN

The state of Wisconsin has a varied geology that allows for water to be obtained from different underground sources, depending on the location. In Wisconsin, there are four principal aquifers:

• The Sand and Gravel Aquifer
• The Eastern Dolomite Aquifer
• The Sandstone and Dolomite Aquifer
• The Crystalline Bedrock Aquifer

These aquifers were formed by various geologic events over time including underground volcanic activity, sedimentation from ancient seas, and glacier deposits.